PAs, PTs, nurses and some other non-doctoral health professions workers do get accepted to medical school. HOWEVER, if they did not take science major's level biology, general chemistry, organic chem, and physics, they will have to take them to be eligible for any of the doctoral health professions schools. If they did take those courses, and they were taken more than about five years ago, many med schools will probably want at least some of them retaken or perhaps some recently taken biol major level courses added, and maybe biochemistry. Non-major level science courses do not meet admissions requirements. Most medical schools require MCATs taken no more than 2 or 3 years ago; 2 or 3 depends on individual schools' requirements.